PT

1. Pacific Time
2. Personal trainer, or training
3. Physical therapy
4. Physical training
5. Postal telegraph
6. Pupil teacher
7. Purchase tax (historical)

pt

1. Part
2. Past
3. Past tense
4. Pint or pints
5. Point
6. Port
7. Post-town

Pt (chem)

Platinum

• cherry-picking
• cherry-picks
• cherry-pie
• cherry-pies
• cherry-pit
• cherry-pits
• cherry plum
• cherry plums
• cherry-stone
• cherry-stones
• cherry tomato
• cherry tomatoes
• chersonese
• chersoneses
• chert
• chertier
• chertiest
• cherts
• cherty
• cherub
• cherubic
• cherubical
• cherubically
• cherubim
• cherubimic